Bahtinov Mask Focusing Mask for Telescopes - 180 Bahtinov Mask for a Tube Outer Diameter from 178-213mm (7.0" to 8.38") - can be Mounted with Brass Bolt Inside or Outside
Focusing mask will help you achieve precise focus in a few seconds. Provide the best focus for your telescope quickly and easily without guessing.
Mask fits telescope tubes with an outer diameter of 178-213mm (7.0" to 8.38") Suitable for use on all types of telescope - reflectors, rafractors, Dobsonians, Mak-Cas and SCTs.
Once accurate focus is achieved, the mask produces a distinct, intersecting 3-line pattern.Its material composition is strengthened plexiglass, which is shaped by precision laser cutting, which is strong and durable. The plexiglass material is not easy to become brittle.
Once mounted on the telescope, three unique adjustable cushion brass bolt provide a firm grip. The rubber sleeve on the surface of the brass bolt can effectively prevent scratches on the surface of the lens barrel, increase the fixed friction, and improve the stability of the installation.
Compatible with any type of telescope, especially suitable for astrophotography, to help you get more accurate images.
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